ASP.NET MVC Html.Dropdown - 設置默認值

Question

昨天我提出以下問題Html.Dropdown - get the the value of each option to be the same as the text?時，我發現這是回答下面的帖子What HTML helper do I use to create a simple dropdownlist that doesn't take in any variables? 現在這一切都很好但是，我怎麼會選擇一個默認值（如每月），這裏是我的代碼...

<%: Html.DropDownList("day", new SelectList(
    new Dictionary<string,string> { { "Weekly", "Weekly" }, { "Monthly", "Monthly" }, { "Quarterly", "Quarterly" }, { "Annually", "Annually" } }, 
    "Key", "Value")) 
%> 

任何幫助，因爲我還沒有找到一個例子來說明這個簡單的要求，將不勝感激，也許我應該對MVC購買一本書嗎？

Answer 1

使用this過載

public SelectList(IEnumerable items, string dataValueField, string dataTextField, object selectedValue); 

最後一個參數被選擇的值。您可以將您的方法重寫爲

<%: Html.DropDownList("day", new 
SelectList(
    new Dictionary<string,string> { { "Weekly", "Weekly" }, { "Monthly", 
"Monthly" }, { "Quarterly", 
"Quarterly" }, { "Annually", 
"Annually" } }, 
    "Key", "Value", "Monthly")) %>